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extension-authoring

Category: General  ·  Sub-category: plugins-extensions  ·  Last updated:
Comprehensive guide for authoring Claude Code extensions including skills (SKILL.md), hooks, slash commands, and subagents. Use when: creating skills, writing hooks, making slash commands, building subagents, learning Claude Code extensions.

From the source SKILL.md

<objective> This skill is the definitive guide for authoring Claude Code extensions. It covers four extension types:

<objective>What it does</objective>
<workflow>How to do it</workflow>
<success_criteria>How to know it worked</success_criteria>

What this skill does

extension-authoring is a community-contributed Claude Code skill in the plugins-extensions sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/extension-authoring-skill/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when: creating skills, writing hooks, making slash commands, building subagents, learning Claude Code extensions.

Who uses this skill

The extension-authoring Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/extension-authoring-skill
curl -L https://claudskills.com/skills/extension-authoring-skill/SKILL.md \
  -o ~/.claude/skills/extension-authoring-skill/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/extension-authoring-skill/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/extension-authoring-skill/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\extension-authoring-skill\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). extension-authoring [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/extension-authoring-skill/
BibTeX
@misc{extension-authoring-skill-2026,
  author    = {ClaudSkills},
  title     = {extension-authoring [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/extension-authoring-skill/}
}

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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